title: Identification of new regulatory genes controlling synthesis of folate-dependent enzymes in Aspergillus nidulans.
abstract: Prototrophic revertants of a meth2 strain of aspergillus nidulans which is impaired in the regulation of synthesis of folate-dependent enzymes were isolated and six of them analysed. In three of the isolates reversion was the result of an intragenic suppressor mutation in the metH locus. In the remaining strains suppressor mutations occurred in independent genes. These genes, designated folA, folB and folC, are linked and located in chromosome VI. Mutations in these genes render synthesis of some folate enzymes, particularly folylpolyglutamate synthetase, insensitive to methionine-mediated repression.
authors.affiliation: Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 5A Pawińskiego St, 02-106 Warszawa, Poland.
authors.forename: Irmina
authors.initials: I
authors.lastname: Lewandowska
authors.affiliation: Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur St, 02-093 Warszawa, Poland.
authors.forename: Malgorzata
authors.initials: M
authors.lastname: Balińska
authors.affiliation: Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 5A Pawińskiego St, 02-106 Warszawa, Poland.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Paszewski
mesh_terms: D001233:Aspergillus nidulans / Q000201:enzymology* / Q000235:genetics* / Q000378:metabolism; D005492:Folic Acid / Q000378:metabolism*; D005800:Genes, Fungal; D005809:Genes, Regulator; D008040:Genetic Linkage; D008715:Methionine / Q000494:pharmacology; D009154:Mutation; D010453:Peptide Synthases / Q000096:biosynthesis; D013489:Suppression, Genetic
chemical_list: D005492:Folic Acid; D008715:Methionine; D010453:Peptide Synthases; C023103:folylpolyglutamate synthetase